Q.

If the external resistance is equal to the internal resistance of a cell of emfE .  The potential difference across its terminal is

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a

E2

b

E

c

2E

d

Zero

answer is A.

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Detailed Solution

External resistance(R) = Internal resistance (r)                              V=E−ir                                   =E−VRR                                   =E−V                             2V=E                          ∴  V=E2
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